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【なでしこ】和暦→西暦変換

More than 3 years have passed since last update.

なでしこで西暦→和暦変換関数はあったのですが逆がなかったのでメモ。
変換出来なかった場合はエラーで落ちてしまうのでエラー監視もつけておきます。

エラー監視
    西暦=和暦に「+0/0/0」を日付加算。  
    和暦=和暦を「yyyy年mm月dd日」に日時形式変換。
エラーならば
    和暦=「」。
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